A fast radial scanning probe system was constructed for the Keda Torus eXperiment(KTX)to measure the profiles of boundary plasma parameters such as floating potential,electron density,temperature,transport fluxes,etc....A fast radial scanning probe system was constructed for the Keda Torus eXperiment(KTX)to measure the profiles of boundary plasma parameters such as floating potential,electron density,temperature,transport fluxes,etc.The scanning probe system is driven by slow and fast motion mechanisms,corresponding to the stand-by movement of a stepping motor and the fast scanning movement of a high-torque servo-motor,respectively.In fast scanning,the scanner drives the probe radially up to 20 cm at a maximum velocity of 4.0 m s-1.A noncontact magnetic grating ruler with a high spatial resolution of 5μm is used for the displacement measurement.New scanning probe can reach the center of plasmas rapidly.The comparison of plasma floating potential profiles obtained by a fixed radial rake probe and the single scanning probe suggests that the high-speed scanning probe system is reliable for measuring edge plasma parameter profiles on the KTX device.展开更多
目的:探讨手绘导航在肺外周结节患者行支气管镜肺活检中的应用价值及其对支气管镜到达活检部位时间的影响因素。方法:回顾性分析2022年8月—2023年3月在宜昌市中心人民医院呼吸内镜中心接受径向超声引导下经支气管镜肺活检的116例肺外...目的:探讨手绘导航在肺外周结节患者行支气管镜肺活检中的应用价值及其对支气管镜到达活检部位时间的影响因素。方法:回顾性分析2022年8月—2023年3月在宜昌市中心人民医院呼吸内镜中心接受径向超声引导下经支气管镜肺活检的116例肺外周结节患者,根据术前是否采用手绘导航规划路径,分为手绘导航联合径向超声组(手绘导航+RP-EBUS-GS组,n=60)和径向超声组(RP-EBUS-GS组,n=56),对比分析手绘导航在支气管镜肺活检中的应用效果。采用单因素及多因素Logistic回归分析手绘导航对支气管镜到达活检部位时间的影响因素。结果:手绘导航+RP-EBUS-GS组支气管镜到达活检部位时间明显短于RP-EBUS-GS组(6.32±3.10 min vs 8.89±4.09 min,P<0.001)。以支气管镜到达活检部位时间为因变量,单因素分析结果显示,两组患者性别、结节与支气管关系、所在支气管分级及是否应用手绘导航有明显差异(均P<0.05);多因素Logistic结果显示,所在支气管分级及是否应用手绘导航是支气管镜到达活检部位时间的独立影响因素(均P<0.05)。结论:手绘导航在肺外周结节患者行支气管镜肺活检中可明显缩短支气管镜到达活检部位的时间,具有很好的临床应用价值。肺外周结节所在支气管分级及是否应用手绘导航是支气管镜到达肺活检部位时间的独立影响因素。展开更多
A novel method to measure the temperature on the surface of micro-hotplate was presented. The tiny fiber probe and the optical power meter were employed to measure the sample radialization power. By means of comparing...A novel method to measure the temperature on the surface of micro-hotplate was presented. The tiny fiber probe and the optical power meter were employed to measure the sample radialization power. By means of comparing the relationship between the radialization power and the temperature, sample surface temperature can be discerned accurately. Such an approach has provided more accuracy than traditional temperature measurements. The experimental result based on this method is quite similar to that of simulation by the finite element analysis (FEA) software of Ansys in theory. This measurement is very useful for measuring temperature for these micro samples prone to be untouchable.展开更多
Time-resolved radial uniformity of pulse-modulated inductively coupled O_(2)/Ar plasma has been investigated by means of a Langmuir probe as well as an optical probe in this paper. The radial uniformity of plasma has ...Time-resolved radial uniformity of pulse-modulated inductively coupled O_(2)/Ar plasma has been investigated by means of a Langmuir probe as well as an optical probe in this paper. The radial uniformity of plasma has been discussed through analyzing the nonuniformity factor β(calculated by the measured n_e, lower β means higher plasma radial uniformity). The results show that during the active-glow period, the radial distribution of ne exhibits an almost flat profile at the beginning phase, but it converts into a parabola-like profile during the steady state. The consequent evolution for β is that when the power is turned on, it declines to a minimum at first, and then it increases to a maximum, after that, it decays until it keeps constant. This phenomenon can be explained by the fact that the ionization gradually becomes stronger at the plasma center and meanwhile the rebuilt electric field(plasma potential and ambipolar potential) will confine the electrons at the plasma center as well. Besides, the mean electron energy( <ε>_(on)) at the pulse beginning decreases with the increasing duty cycle. This will postpone the plasma ignition after the power is turned on. This phenomenon has been verified by the emission intensity of Ar(λ = 750.4 nm). During the after-glow period, it is interesting to find that the electrons have a large depletion rate at the plasma center. Consequently, ne forms a hollow distribution in the radial direction at the late stage of after-glow. Therefore, β exhibits a maximum at the same time. This can be attributed to the formation of negative oxygen ion(O^(-)) at the plasma center when the power has been turned off.展开更多
基金supported by the National Magnetic Confinement Fusion Science Program of China(No.2017YFE0301700)National Natural Science Foundation of China(No.11635008).
文摘A fast radial scanning probe system was constructed for the Keda Torus eXperiment(KTX)to measure the profiles of boundary plasma parameters such as floating potential,electron density,temperature,transport fluxes,etc.The scanning probe system is driven by slow and fast motion mechanisms,corresponding to the stand-by movement of a stepping motor and the fast scanning movement of a high-torque servo-motor,respectively.In fast scanning,the scanner drives the probe radially up to 20 cm at a maximum velocity of 4.0 m s-1.A noncontact magnetic grating ruler with a high spatial resolution of 5μm is used for the displacement measurement.New scanning probe can reach the center of plasmas rapidly.The comparison of plasma floating potential profiles obtained by a fixed radial rake probe and the single scanning probe suggests that the high-speed scanning probe system is reliable for measuring edge plasma parameter profiles on the KTX device.
文摘目的:探讨手绘导航在肺外周结节患者行支气管镜肺活检中的应用价值及其对支气管镜到达活检部位时间的影响因素。方法:回顾性分析2022年8月—2023年3月在宜昌市中心人民医院呼吸内镜中心接受径向超声引导下经支气管镜肺活检的116例肺外周结节患者,根据术前是否采用手绘导航规划路径,分为手绘导航联合径向超声组(手绘导航+RP-EBUS-GS组,n=60)和径向超声组(RP-EBUS-GS组,n=56),对比分析手绘导航在支气管镜肺活检中的应用效果。采用单因素及多因素Logistic回归分析手绘导航对支气管镜到达活检部位时间的影响因素。结果:手绘导航+RP-EBUS-GS组支气管镜到达活检部位时间明显短于RP-EBUS-GS组(6.32±3.10 min vs 8.89±4.09 min,P<0.001)。以支气管镜到达活检部位时间为因变量,单因素分析结果显示,两组患者性别、结节与支气管关系、所在支气管分级及是否应用手绘导航有明显差异(均P<0.05);多因素Logistic结果显示,所在支气管分级及是否应用手绘导航是支气管镜到达活检部位时间的独立影响因素(均P<0.05)。结论:手绘导航在肺外周结节患者行支气管镜肺活检中可明显缩短支气管镜到达活检部位的时间,具有很好的临床应用价值。肺外周结节所在支气管分级及是否应用手绘导航是支气管镜到达肺活检部位时间的独立影响因素。
基金Project (60104006) supported by the National Natural Science Foundation of China Project(20030322) supported by the Science Technology Office of Jilin Province
文摘A novel method to measure the temperature on the surface of micro-hotplate was presented. The tiny fiber probe and the optical power meter were employed to measure the sample radialization power. By means of comparing the relationship between the radialization power and the temperature, sample surface temperature can be discerned accurately. Such an approach has provided more accuracy than traditional temperature measurements. The experimental result based on this method is quite similar to that of simulation by the finite element analysis (FEA) software of Ansys in theory. This measurement is very useful for measuring temperature for these micro samples prone to be untouchable.
基金supported by the National Natural Science Foundation of China (Grant Nos. 11805150, 11875100, 11705141, and 11775282)the Dean Fund of the School of Optoelectronic Engineering (Grant No. 2019GDYT04)+1 种基金the Fund from the Xi'an Key Laboratory of Intelligent Detection and Perception (Grant No. 201805061ZD12CG45)the Key Industry Innovation Chain Project of Shaanxi Provincial Science and the Technology Department,China (Grant No. 2018ZDCXL-GY-08-02-01)。
文摘Time-resolved radial uniformity of pulse-modulated inductively coupled O_(2)/Ar plasma has been investigated by means of a Langmuir probe as well as an optical probe in this paper. The radial uniformity of plasma has been discussed through analyzing the nonuniformity factor β(calculated by the measured n_e, lower β means higher plasma radial uniformity). The results show that during the active-glow period, the radial distribution of ne exhibits an almost flat profile at the beginning phase, but it converts into a parabola-like profile during the steady state. The consequent evolution for β is that when the power is turned on, it declines to a minimum at first, and then it increases to a maximum, after that, it decays until it keeps constant. This phenomenon can be explained by the fact that the ionization gradually becomes stronger at the plasma center and meanwhile the rebuilt electric field(plasma potential and ambipolar potential) will confine the electrons at the plasma center as well. Besides, the mean electron energy( <ε>_(on)) at the pulse beginning decreases with the increasing duty cycle. This will postpone the plasma ignition after the power is turned on. This phenomenon has been verified by the emission intensity of Ar(λ = 750.4 nm). During the after-glow period, it is interesting to find that the electrons have a large depletion rate at the plasma center. Consequently, ne forms a hollow distribution in the radial direction at the late stage of after-glow. Therefore, β exhibits a maximum at the same time. This can be attributed to the formation of negative oxygen ion(O^(-)) at the plasma center when the power has been turned off.
